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1、維普資訊http://www.cqvip.com第26卷第2期大慶石油地質(zhì)與開(kāi)發(fā)P．G．O．D．D．2007年4月·9I·文章編號(hào)：1000—3754(2007)02-0091-05螺旋布孔射孔對(duì)套管強(qiáng)度的影響董平川，牛彥良，李莉，沈曉英(1．fl1壬i油定油歉ff濰畦炙驗(yàn)．北
2、102249；2．茨浦l{1矗礅菠住公翻勘探阡笈研哆￡院．黑J宅汀火慶I637I2：3．I，家婦I：權(quán)J．6々利J．6．北j100088)摘要：射孔是造成套管損壞的重要原因之一。建立了射孔套管的有限元力學(xué)模型。采用彈塑性有限元法。分別對(duì)
3、螺旋布孔射孔套管采用不同的射孔孔徑、射孔密度和射孔相位給套管強(qiáng)度造成的影響進(jìn)行了模擬和分析分析了不同孔徑、孔密及相位角的射孔套管在外擠壓力作用下的孔眼應(yīng)力集中系數(shù)的變化規(guī)律。結(jié)果表明，射孔后套管的極限承載能力均有不同程度的下降，下降幅度與射孔密度有關(guān)。射孔后套管內(nèi)的應(yīng)力隨射孔孔徑、射孔密度和射孔相位的增加而增大，并使套管的抗拉、抗壓強(qiáng)度降低因此，在套管柱設(shè)計(jì)時(shí)應(yīng)該考慮射孔的影響。最后，通過(guò)對(duì)幾種布孔方案進(jìn)行對(duì)比分析。找出了射孔套管的優(yōu)選布孔方案．．為射孔完井優(yōu)選設(shè)計(jì)提供了合理的模型，為射孔段套管柱的合理設(shè)計(jì)提供
4、了承載能力計(jì)算的可靠依據(jù)關(guān)鍵詞：螺旋布孔；射孔套管；應(yīng)力集中系數(shù)；套管強(qiáng)度；彈塑性有限元法中圖分類(lèi)號(hào)：TEI12．23文獻(xiàn)標(biāo)識(shí)碼：AEfectofhelixdistributingperforationoncasingstrength’DONGPing．chuan。NIUYan—liang。一LILi。一SHENXiao—ying。，(1．KeyLaboratoryofPetroleumEngineeringinMinistryofEducation，ChinaUniversityofPetroleum，ng1
5、02249，China；2．ExplorationandDevelopmentResearchInstituteofDaqingDCompanyLtd．，Daq／,~163712。China；3．StateIntellectualPropertyOf~weofChina，Beifing100088，China)Abstract：Oneofimportantcauseofcasingdamageiscasingperforation．Finiteelementmechanicalmodelofperforated
6、casingisestablished。andefectofperforatingoncasingstrength。especiallyinfluenceofperforationdiameter，perfora—tiondensityandperforationphaseangleoncasingstrengthisstudiedbyusingelasticandplasticfiniteelementnumericalmodelingmethod．Underouterpressurecondition。fi
7、niteelementanalysisofstressconcentrationCO—efficientinperfora—tedcasingisstudiedwithdiferentperforationdiameter，perforationdensityandphaseangle．Resultsofnumericalmod-"clingshowthatstrengthofcasingreduceswithperforationdensity，andthatstressinperforatedcasingi
8、ncreaseswiththeincreaseofabove—mentionedperforatingparameters。resultingindecreaseoftensilestrengthandcompressionstrength．Thereformefectofperforationshouldbeconsideredindesignofcasingstring．Optimizedschemeforholdingperforationisidentifiedbycomparingdiferentsc
9、hemesforholdingperforation．Analysisresultprovidesreasonablemodelforoptimi—zationdesignofperforatingwellcompletionandreliablefoundationofsustainabilitycomputationforreasonabledesignforperforating
